Select the related word/letters/number from the given alternatives.
? : GA :: QR : JI

Let's look at the known relationship pair QR:JI:
Q=17, R=18

J=10, I=9

The pattern between the first and second term of the pair is:

Q(17)
−7

​
J(10)

R(18)
−9

​
I(9)

Let's apply the same logic in reverse to find the missing term before GA:

G=7, A=1

First letter−7=G(7)⟹First letter=7+7=14→N

Second letter−9=A(1)⟹Second letter=1+9=10→J

Since NJ is not in the options, let's look at an alternate relation between the pairs (First word:Third word) and (Second word:Fourth word):
Comparing GA and JI:

G(7)
+3

​
J(10)

A(1)
+8

​
I(9)

Applying this logic to find the missing term X that connects to QR(17,18):

First letter of X
+3

​
Q(17)⟹17−3=14→N

Second letter of X
+8

​
R(18)⟹18−8=10→J

Still yields NJ. Let's re-verify positional shifts within options:
Let's look at the sum of position values:

QR=17+18=35

JI=10+9=19

Difference =35−19=16

Let's look at GA=7+1=8. The missing term sum should be 8+16=24.
Checking options for positional sums:

KN=11+14=25

RS=18+19=37

NQ=14+17=31

TZ=20+26=46

Let's analyze standard alphabetical opposite shifts:

Q→J (Opposite pair: Q+J=27)

R→I (Opposite pair: R+I=27)

Thus, the letters in the second term are the exact alphabetical opposites of the letters in the first term.
Applying this logic to GA:

Opposite of G is T (27−7=20→T)

Opposite of A is Z (27−1=26→Z)

Therefore, the missing term is TZ.